What I said, 5-7 people seem to be the maximum amount people that work efficiently on an agricultural exploitation before you have to add in various administrative and coordination tasks.

Land area OTOH is very variable, depending on the type of production, the amount of capital available... A shepherd with a dog can look over a much larger herd than without...

The insight is that agriculture is very easy to decentralise, which is why economies of scale don't apply.

Un roi sans divertissement est un homme plein de misères